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Articles 10801 - 10830 of 13846

Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering

Finding And Optimising The Key Factors For The Multiple-Response Manufacturing Process, Jeh-Nan Pan, Jianbiao Pan, Chun-Yi Lee Jan 2009

Finding And Optimising The Key Factors For The Multiple-Response Manufacturing Process, Jeh-Nan Pan, Jianbiao Pan, Chun-Yi Lee

Industrial and Manufacturing Engineering

With the advent of modern technology, manufacturing processes became so sophisticated that a single quality characteristic cannot reflect the true product quality. Thus, it is essential to perform the key factor analysis for the manufacturing process with multiple-input (factors) and multiple-output (responses). In this paper, an integrated approach of using the desirability function in conjunction with the Mahalanobis-Taguchi-Gram Schmit (MTGS) system is proposed in order to find and optimise the key factors for a multiple-response manufacturing process. The aim of using the MTGS method is to standardise and orthogonalise the multiple responses so that the Mahalanobis distance for each run …

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Effects Of Reflow Profile And Thermal Conditioning On Intermetallic Compound Thickness For Snagcu Soldered Joints, Jianbiao Pan, Tzu-Chien Chou, Jasbir Bath, Dennis Willie, Brian J. Toleno Jan 2009

Effects Of Reflow Profile And Thermal Conditioning On Intermetallic Compound Thickness For Snagcu Soldered Joints, Jianbiao Pan, Tzu-Chien Chou, Jasbir Bath, Dennis Willie, Brian J. Toleno

Industrial and Manufacturing Engineering

Purpose – The purpose of this paper is to investigate the effects of reflow time, reflow peak temperature, thermal shock and thermal aging on the intermetallic compound (IMC) thickness for Sn3.0Ag0.5Cu (SAC305) soldered joints.
Design/methodology/approach – A four-factor factorial design with three replications is selected in the experiment. The input variables are the peak temperature, the duration of time above solder liquidus temperature (TAL), solder alloy and thermal shock. The peak temperature has three levels, 12, 22 and 32°C above solder liquidus temperatures (or 230, 240 and 250°C for SAC305 and 195, 205, and 215°C for SnPb). The TAL has …

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Comparison Of The Trivalent Live Attenuated Vs. Inactivated Influenza Vaccines Among U.S. Military Service Members, Angelia A. Eick, Zhong Wang, Hayley Hughes, Stephen M. Ford, Steven K. Tobler Jan 2009

Comparison Of The Trivalent Live Attenuated Vs. Inactivated Influenza Vaccines Among U.S. Military Service Members, Angelia A. Eick, Zhong Wang, Hayley Hughes, Stephen M. Ford, Steven K. Tobler

United States Army: Publications

Limited effectiveness data are available comparing live attenuated influenza vaccine (LAIV) to inactivated influenza vaccine (TIV) among adults. To compare the incidence of influenza-like illness following immunization of adults with LAIV vs. TIV,we conducted a retrospective cohort analysis of active component U.S. military personnel for the 2005–2006 and 2006–2007 influenza seasons. Recruits experienced a much higher burden of disease compared to non-recruits, with crude incidence rates of influenza-like illness 2–16 times higher than non-recruits depending on the season and cohort. For both seasons, a slightly greater protection from influenza-like illness was found for non-recruits who received TIV compared to LAIV …

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Unimolecular Decomposition Of 5-Aminotetrazole And Its Tautomer 5-Iminotetrazole: New Insight From Isopotential Searching, Kristian W. Paul, Margaret M. Hurley, Karl K. Irikura Jan 2009

Unimolecular Decomposition Of 5-Aminotetrazole And Its Tautomer 5-Iminotetrazole: New Insight From Isopotential Searching, Kristian W. Paul, Margaret M. Hurley, Karl K. Irikura

United States Army: Publications

Aminotetrazole compounds have become attractive ingredients in gas generating compositions, solid rocket propellants, and green pyrotechnics. Therefore, a fundamental understanding of their thermal decomposition mechanisms and thermodynamics is of great interest. In this study, the specular reflection isopotential searching method was used to investigate the unimolecular decomposition mechanisms of 5-iminotetrazole (5-ITZ), 1H-5-aminotetrazole (1H-5-ATZ), and 2H-5-aminotetrazole (2H-5-ATZ). Subsequent thermochemical analysis of the unimolecular decomposition pathways was performed at the CCSD(T)/aug-cc-pVTZ//B3LYP/6- 311++G(3df,3pd) level of theory. Based upon the relative reaction barriers predicted in this study, the initial gaseous products of 5-ITZ unimolecular decomposition are HN3 and NH2CN (calculated activation …

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Three Examples Where The Specific Surface Area Of Snow Increased Over Time, F. Domine, A. S. Taillandier, A. Cabanes, T. A. Douglas, M. Sturm Jan 2009

Three Examples Where The Specific Surface Area Of Snow Increased Over Time, F. Domine, A. S. Taillandier, A. Cabanes, T. A. Douglas, M. Sturm

United States Army: Publications

Snow on the ground impacts climate through its high albedo and affects atmospheric composition through its ability to adsorb chemical compounds. The quantification of these effects requires the knowledge of the specific surface area (SSA) of snow and its rate of change. All relevant studies indicate that snow SSA decreases over time. Here, we report for the first time three cases where the SSA of snow increased over time. These are (1) the transformation of a melt-freeze crust into depth hoar, producing an increase in SSA from 3.4 to 8.8m2 kg−1. (2) The mobilization of surface snow …

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Three Examples Where The Specific Surface Area Of Snow Increased Over Time, F. Domine, A.-S. Taillandier, A. Cabanes, T. A. Douglas, M. Sturm Jan 2009

Three Examples Where The Specific Surface Area Of Snow Increased Over Time, F. Domine, A.-S. Taillandier, A. Cabanes, T. A. Douglas, M. Sturm

United States Army: Publications

Snow on the ground impacts climate through its high albedo and affects atmospheric composition through its ability to adsorb chemical compounds. The quantification of these effects requires the knowledge of the specific surface area (SSA) of snow and its rate of change. All relevant studies indicate that snow SSA decreases over time. Here, we report for the first time three cases where the SSA of snow increased over time. These are (1) the transformation of a melt-freeze crust into depth hoar, producing an increase in SSA from 3.4 to 8.8m2 kg−1. (2) The mobilization of surface snow …

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Automated Fixture Design For A Rapid Machining Process, Wutthigrai Boonsuk, Matthew C. Frank Jan 2009

Automated Fixture Design For A Rapid Machining Process, Wutthigrai Boonsuk, Matthew C. Frank

Faculty Research & Creative Activity

Rapid prototyping techniques for CNC machining have been developed in an effort to produce functional prototypes in appropriate materials. One of the major challenges for rapid machining is to develop an automatic fixturing system for securing the part during the machining process. The method proposed in this paper is the use of sacrificial fixturing, similar to the support structures in existing rapid processes like Stereolithography. During the machining process, sacrificial supports emerge incrementally and, at the end of the process, are the only entities connecting the part to the stock material. This paper presents methodologies for the design of sacrificial …

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Automated Fixture Design For A Rapid Machining Process, Wutthigrai Boonsuk, Matthew Frank Jan 2009

Automated Fixture Design For A Rapid Machining Process, Wutthigrai Boonsuk, Matthew Frank

Faculty Research & Creative Activity

Rapid prototyping techniques for CNC machining have been developed in an effort to produce functional prototypes in appropriate materials. One of the major challenges for rapid machining is to develop an automatic fixturing system for securing the part during the machining process. The method proposed in this paper is the use of sacrificial fixturing, similar to the support structures in existing rapid processes like Stereolithography. During the machining process, sacrificial supports emerge incrementally and, at the end of the process, are the only entities connecting the part to the stock material. This paper presents methodologies for the design of sacrificial …

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The Effect Of Ultrasonic Frequency On Gold Wire Bondability And Reliability, Jianbiao Pan, Minh-Nhat Le, Cuong Van Pham Jan 2009

The Effect Of Ultrasonic Frequency On Gold Wire Bondability And Reliability, Jianbiao Pan, Minh-Nhat Le, Cuong Van Pham

Industrial and Manufacturing Engineering

This paper presents a systematic study on the effect of 120 KHz ultrasonic frequency on the bondability and reliability of fine pitch gold wire bonding to pads over an organic substrate with gold metallizations. The study was carried out on a thermosonic ball bonder that is allowed to easily switch between ultrasonic frequencies of 60 KHz and 120 KHz by changing the ultrasonic transducer and the ultrasonic generator. Bonding parameters were optimized through the design of experimental methodology for four different cases: 25.4 mm wire at 60 kHz, 25.4 mm wire at 120 kHz, 17.8 mm wire at 60 kHz, …

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Tomato Bushy Stunt Virus (Tbsv), A Versatile Platform For Polyvalent Display Of Antigenic Epitopes And Vaccine Design, Shantanu Kumar, Wendy Ochoa, Pratik Singh, Catherine Hsu, Anette Schneemann, Marianne Manchester, Mark Olson, Vijay Reddy Jan 2009

Tomato Bushy Stunt Virus (Tbsv), A Versatile Platform For Polyvalent Display Of Antigenic Epitopes And Vaccine Design, Shantanu Kumar, Wendy Ochoa, Pratik Singh, Catherine Hsu, Anette Schneemann, Marianne Manchester, Mark Olson, Vijay Reddy

United States Army: Publications

Viruses-like particles (VLPs) are frequently being used as platforms for polyvalent display of foreign epitopes of interest on their capsid surface to improve their presentation enhancing the antigenicity and host immune response. In the present study, we used the VLPs of Tomato bushy stunt virus (TBSV), an icosahedral plant virus, as a platform to display 180 copies of 16 amino acid epitopes of ricin toxin fused to the C-terminal end of a modified TBSV capsid protein (NΔ52). Expression of the chimeric recombinant protein in insect cells resulted in spontaneous assembly of VLPs displaying the ricin epitope. Cryo-electron microscopy and image …

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Simulated Rainfall-Driven Dissolution Of Tnt, Tritonal, Comp B And Octol Particles, Susan Taylor, James H. Lever, Jennifer Fadden, Nancy Perron, Bonnie Packer Jan 2009

Simulated Rainfall-Driven Dissolution Of Tnt, Tritonal, Comp B And Octol Particles, Susan Taylor, James H. Lever, Jennifer Fadden, Nancy Perron, Bonnie Packer

United States Army: Publications

Live-fire military training can deposit millimeter-sized particles of high explosives (HE) on surface soils when rounds do not explode as intended. Rainfall-driven dissolution of the particles then begins a process whereby aqueous HE solutions can enter the soil and groundwater as contaminants. We dripped water onto individual particles of TNT, Tritonal, Comp B and Octol to simulate how surface-deposited HE particles might dissolve under the action of rainfall and to use the data to verify a model that predicts HE dissolution as a function of particle size, particle composition and rainfall rate. Particle masses ranged from 1.1 to 17 mg …

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Complementary And Alternative Medicine For The Allergist-Immunologist: Where Do I Start?, Renata J. M. Engler, Catherine M. With, Philip J. Gregory, Jeff M. Jellin Jan 2009

Complementary And Alternative Medicine For The Allergist-Immunologist: Where Do I Start?, Renata J. M. Engler, Catherine M. With, Philip J. Gregory, Jeff M. Jellin

United States Army: Publications

Complementary and alternative medicine (CAM) therapies present a growing information management challenge for physicians because nearly 40% of their patients may be using and another 50% may be considering use of CAM as part of their health care regimen. The National Health Statistics Reports for 2007 described the most commonly used nonvitamin, nonmineral therapy as natural products (eg, herbals at 17.7%). More than5% of children under the age of 18 years used CAM for allergic conditions including asthma. The amount and quality of information available and concerns about liability risk represent a challenge for most physicians. This review focuses on …

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First Results From Radar Profiles Collected Along The Us-Itase Traverse From Taylor Dome To South Pole (2006–2008), Brian C. Welch, Robert W. Jacobel, Steven A. Arcone Jan 2009

First Results From Radar Profiles Collected Along The Us-Itase Traverse From Taylor Dome To South Pole (2006–2008), Brian C. Welch, Robert W. Jacobel, Steven A. Arcone

United States Army: Publications

The 2006/07 and 2007/08 US-ITASE traverses from Taylor Dome to South Pole in East Antarctica provided opportunities to survey the subglacial and englacial environments using 3MHz and 200MHz radar. We present first results of these new ground-based radar data. A prominent basal deformation layer indicates different ice-flow regimes for the northern and southern halves of the Byrd Glacier drainage. Buried dune stratigraphy that appears to be related to the megadunes towards the west occurs at depths of up to 1500 m. At least two new water-filled subglacial lakes were discovered, while two recently drained lakes identified from repeat ICESat surface …

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Rubric For Presentation Evaluation, Paul Savory Jan 2009

Rubric For Presentation Evaluation, Paul Savory

Department of Industrial and Management Systems Engineering: Instructional Materials

I have developed this rubric to allow classmates and myself to offer an evaluation or assessment of a student classroom presentation. It is my attempt to develop a standardized evaluation linked to specified criteria, making the grading process simpler and more transparent.

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Rubric For Project Report Evaluation, Paul Savory Jan 2009

Rubric For Project Report Evaluation, Paul Savory

Department of Industrial and Management Systems Engineering: Instructional Materials

I have developed this rubric to formalize the evaluation or assessment of a project report. It is my attempt to develop a standardized evaluation linked to specified criteria, making the grading process simpler and more transparent.

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The Impact Of Communication Medium On Team Performance Patterns, Pilar Pazos, Mario G. Beruvides Jan 2009

The Impact Of Communication Medium On Team Performance Patterns, Pilar Pazos, Mario G. Beruvides

Engineering Management & Systems Engineering Faculty Publications

The increased impact of globalization and rapidly changing technologies are some of the biggest challenges facing 21st century organizations. Remote teams supported through computer-based systems have been identified as a key lever to help organizations adapt to this turbulent environment. This study sheds some light on how teams perform and adapt by evaluating performance and synergy over time for teams in two different settings: computer supported and face-to-face. Participants in the study were randomly assigned either to a computer-supported or a face-to face group. Each group met over three sessions to perform a series of tasks that were evaluated using …

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An Analogy Based Costing System For Injection Molds Based Upon Geometry Similarity With Wavelets, Cyrus Clinton Hillsman Jan 2009

An Analogy Based Costing System For Injection Molds Based Upon Geometry Similarity With Wavelets, Cyrus Clinton Hillsman

Electronic Theses and Dissertations

The injection molding industry is large and diversified. However there is no universally accepted way to bid molds, despite the fact that the mold and related design comprise 50% of the total cost of an injection-molded part over its lifetime. This is due to both the structure of the industry and technical difficulties in developing an automated and practical cost estimation system. The technical challenges include lack of a common data format for both parts and molds; the comprehensive consideration of the data about a wide variety of mold types, designs, complexities, number of cavities and other factors that directly …

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Integration Of Data Mining Algorithms And Control Charts For Multivariate And Autocorrelated Processes, Weerawat Jitpitaklert Jan 2009

Integration Of Data Mining Algorithms And Control Charts For Multivariate And Autocorrelated Processes, Weerawat Jitpitaklert

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

The objective of this dissertation is to integrate state-of-the-art data mining algorithms with statistical process control (SPC) tools to achieve efficient monitoring in multivariate and autocorrelated process. Process monitoring and diagnosis have been widely recognized as important and critical tools in system monitoring for detection of abnormal behavior and quality improvement. Although traditional SPC tools are effective in simple manufacturing processes that generate a small volume of independent data, these tools are not capable of handling the large streams of multivariate and autocorrelated data found in modern manufacturing/service systems. As the limitations of SPC methodology become increasingly obvious in the …

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Emergency Evacuation Route Planning Considering Human Behavior During Short- And No-Notice Emergency Situations, Suebpong Kittirattanapaiboon Jan 2009

Emergency Evacuation Route Planning Considering Human Behavior During Short- And No-Notice Emergency Situations, Suebpong Kittirattanapaiboon

Electronic Theses and Dissertations

Throughout United States and world history, disasters have caused not only significant loss of life, property but also enormous financial loss. The tsunami that occurred on December 26, 2004 is a telling example of the devastation that can occur unexpectedly. This unexpected natural event never happened before in this area. In addition, there was a lack of an emergency response plan for events of that magnitude. Therefore, this event resulted not only in a natural catastrophe for the people of South and Southeast Asia, but it is also considered one of the greatest natural disasters in world history. After the …

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Physical Ergonomic And Mental Workload Factors Of Mobile Learning Affecting Performance Of Adult Distance Learners: Student Pers, Rochelle Jones Jan 2009

Physical Ergonomic And Mental Workload Factors Of Mobile Learning Affecting Performance Of Adult Distance Learners: Student Pers, Rochelle Jones

Electronic Theses and Dissertations

Distance education is the fastest growing educational modality because of advances information technology has made over the past 25 years. Adult learners have become the fastest growing population in distance education. Adult learners, through technical tools and devices they use on the job, have become more digitally literate and mobile, making the ability to access class work on the go a necessity. Mobile learning or m-learning (learning that uses wireless, portable, mobile computing, and communication devices) is becoming an extension of distance learning, providing a channel for students to learn, communicate, and access educational material outside the traditional classroom environment. …

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Novel Nonparametric Control Charts For Monitoring Multivariate Processes, Panitarn Chongfuangprinya Jan 2009

Novel Nonparametric Control Charts For Monitoring Multivariate Processes, Panitarn Chongfuangprinya

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

The objective of this dissertation is to develop novel nonparametric control charts to effectively monitor and diagnose multivariate processes with a minimal set of modeling assumptions. Statistical process control (SPC) is a set of procedures that uses statistical techniques to measure, analyze, and reduce process variation. A control chart, which is a special type of graph showing the results of periodic inspections over time, is the primary and most successful SPC tool in real-world applications. This dissertation proposes two nonparametric multivariate control charts based on (1) a support vector machines (SVM) algorithm and (2) a linkage ranking algorithm. The first …

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Unsupervised Data Mining Methods For Functional Data Analysis And Feature Selection, Panaya Rattakorn Jan 2009

Unsupervised Data Mining Methods For Functional Data Analysis And Feature Selection, Panaya Rattakorn

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

The objective of this dissertation is to develop new unsupervised data mining methods for functional data analysis and feature selection. Unsupervised learning is a modeling process that facilitates the extraction of implicit patterns and elicits the natural groupings within the dataset without using any information from the output (response) variable. This dissertation consists of two main parts: (1) unsupervised clustering approaches for functional data analysis and (2) unsupervised feature selection. Functional data analysis has gained significant attention from a variety of disciplines. In this dissertation we propose an effective clustering procedure to categorize a number of profiles that are formed …

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Methodology To Forecast Product Returns For The Consumer Electronics Industry, Amit Potdar Jan 2009

Methodology To Forecast Product Returns For The Consumer Electronics Industry, Amit Potdar

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Reverse logistics has gained much attention in recent years. It is becoming a value added area of a supply chain network day by day. For enterprises, it has therefore become essential to manage the reverse flow of materials in an efficient way to gain competitive advantage. One important aspect of reverse logistics is to have a correct and timely estimation of the reverse flow of materials. Improved forecast accuracy leads to a better decision making in strategic, tactical and operational areas of an organization. Intrinsic (time series) and extrinsic (causal) forecasting are some of the well known and frequently used …

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New Heuristics For The 0-1 Multi-Dimensional Knapsack Problems, Haluk Akin Jan 2009

New Heuristics For The 0-1 Multi-Dimensional Knapsack Problems, Haluk Akin

Electronic Theses and Dissertations

This dissertation introduces new heuristic methods for the 0-1 multi-dimensional knapsack problem (0-1 MKP). 0-1 MKP can be informally stated as the problem of packing items into a knapsack while staying within the limits of different constraints (dimensions). Each item has a profit level assigned to it. They can be, for instance, the maximum weight that can be carried, the maximum available volume, or the maximum amount that can be afforded for the items. One main assumption is that we have only one item of each type, hence the problem is binary (0-1). The single dimensional version of the 0-1 …

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Direct Manipulation Of Virtual Objects, Long Nguyen Jan 2009

Direct Manipulation Of Virtual Objects, Long Nguyen

Electronic Theses and Dissertations

Interacting with a Virtual Environment (VE) generally requires the user to correctly perceive the relative position and orientation of virtual objects. For applications requiring interaction in personal space, the user may also need to accurately judge the position of the virtual object relative to that of a real object, for example, a virtual button and the user's real hand. This is difficult since VEs generally only provide a subset of the cues experienced in the real world. Complicating matters further, VEs presented by currently available visual displays may be inaccurate or distorted due to technological limitations. Fundamental physiological and psychological …

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The Integrated User Experience Evaluation Model: A Systematic Approach To Integrating User Experience Data Sources, Roberto Champney Jan 2009

The Integrated User Experience Evaluation Model: A Systematic Approach To Integrating User Experience Data Sources, Roberto Champney

Electronic Theses and Dissertations

Evaluating the user experience (UX) associated with product interaction is a challenge for current human-systems developers. This is largely due to a lack of theoretical guidance for directing how best to assess the UX and a paucity of tools to support such evaluation. This dissertation provided a framework and tools for guiding and supporting evaluation of the user experience. This doctoral research involved reviewing the literature on UX, using this knowledge to build first build a theoretical model of the UX construct and later develop a theoretical model to for the evaluation of UX in order to aid evaluators – …

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Genetic Stigmergy: Framework And Applications, Joshua A. Brandoff Jan 2009

Genetic Stigmergy: Framework And Applications, Joshua A. Brandoff

Graduate Dissertations and Theses

Stigmergy has long been studied and recognized as an effective system for self-organization among social insects. Through the use of chemical agents known as pheromones, insect colonies are capable of complex collective behavior often beyond the scope of an individual agent. In an effort to develop human-made systems with the same robustness, scientists have created artificial analogues of pheromone-based stigmergy, but these systems often suffer from scalability and complexity issues due to the problems associated with mimicking the physics of pheromone diffusion. In this thesis, an alternative stigmergic framework called 'Genetic Stigmergy' is introduced. Using this framework, agents can indirectly …

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Designing Multi-Objective Reverse Logistics Networks Using Genetic Algorithms, Sanya Yimsiri Jan 2009

Designing Multi-Objective Reverse Logistics Networks Using Genetic Algorithms, Sanya Yimsiri

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Reverse logistics (RL) involves management of activities that include collection, sort/storage, transportation, recovery, disposal and re-distribution. The product return process is more complicated than forward logistics due to presence of multiple reverse distribution channels, individualized returns with small quantities, extended order cycles associated with product exchanges and a variety of recovery and disposition options. Reverse logistics has been gaining interest from many sectors due to rising costs, environmental concern and tougher regulations. As a result, good reverse logistics network design can help business save costs and meet their bottom lines in this competitive global environment. Most of the previous research …

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Performance Evaluation In Reverse Logistics With Data Envelopment Analysis, Ake Tonanont Jan 2009

Performance Evaluation In Reverse Logistics With Data Envelopment Analysis, Ake Tonanont

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Good reverse logistics design can save cost, increase revenues, and gain competitive edges over the rivals. Design of the optimized reverse supply chain model is a very important task to help enterprises save cost and gain benefits from their supply chains. In this study, reverse logistics is considered as a part of the Closed Loop Supply Chain (CLSC). CLSC combines forward and reverse flow together in the supply chain. Each component in a forward and reverse supply chain results in the efficiency of CLSC. Therefore, considering forward and reverse supply chain together as a CLSC will result in more benefits …

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Software Capacity Planning: A Methodology For A Portfolio Of High Technology Product Development Projects, Rajiv Malhotra Jan 2009

Software Capacity Planning: A Methodology For A Portfolio Of High Technology Product Development Projects, Rajiv Malhotra

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

High technology product development projects make extensive use of engineering software during the product development process. The suite of engineering software tools deployed during product development represents a significant portion of the product development costs. The ability to forecast the engineering software license capacity required to support product development plans is crucial for budgeting, return on investment (ROI) calculations, contract negotiations with the software suppliers, and the provision of an IT infrastructure necessary to support the execution of the software tools. This research shows that the usage of engineering application software in high technology is cyclical due to the characteristics …

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